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Ultra-Low Power PMIC with 3-Output SIMO, Power Path Charger Optimized for Small Li+, 425mA Current Sink, and 8 GPIOs

Ultra-Low Power PMIC with 3-Output SIMO, Power Path Charger Optimized for Small Li+, 425mA Current Sink, and 8 GPIOs

Product Details

The MAX77278 provides a highly-integrated battery charging and power supply solution for low-power applications where size and efficiency are critical.The device features a single-inductor multiple-output (SIMO) buck-boost regulator that provides three independently programmable power rails from a single inductor to minimize total solution size. A 50mA LDO provides ripple rejection for audio and other noise-sensitive applications. A highly-configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA).

The device includes other features such as a programmable current sink that can be used to drive an IR-LED, 8 general-purpose input/output (GPIO) control pins, and an analog multiplex (AMUX) output that provides access to useful battery charging signals. A bidirectional I2C interface allows for configuring and checking the status of the device. An internal on/off controller provides a controlled startup sequence for the regulators and provides supervisory functionality when the device is on. Numerous factory programmable options allow the device to be tailored for many applications, enabling faster time to market.

Design Solution: Choose a Tailored SIMO PMIC for Your Portable Design ›

Key Features

  • Highly Integrated
    • Smart Power Selector™ Li+/Li-Poly Charger
    • Three Output, SIMO Buck-Boost Regulator
    • 50mA LDO with SIMO Fixed Headroom Control
    • Programmable 250mA to 425mA Current Sink Driver
    • Analog MUX Output for Power Monitoring
    • Eight GPIOs (Configured for One-Button Wake-Up and Two-Button Shutdown)
  • Low Power
    • 0.3µA Standby Current
    • 16µA Operating Current
  • Charger Optimized for Small Battery Size
    • Programmable Fast-Charge Current from 7.5mA to 300mA
    • Programmable Battery Regulation Voltage from 3.6V to 4.6V
    • Programmable Termination Current from 0.375mA to 45mA
    • JEITA Battery Temperature Monitors Adjust Charge Current and Battery Regulation Voltage for Safe Charging
  • Flexible and Configurable
    • I2C-Compatible Interface
    • Eight GPIOs
    • Factory OTP Options Available
  • Small Size
    • 3.15mm x 2.15mm x 0.7mm
    • 35-Bump, 0.4mm-Pitch, 7x5 Ball Array, WLP
    • Small Total Solution Size (24mm2)

Applications/Uses

  • Internet of Things (IoT) Gadgets
  • Remote Controls, Game Pads, Media Center Controllers
  • Smart Home Automation Pads, Thermostats, Battery-Powered User Interfaces
  • Wearables, Fitness and Health Monitors
Parametric specs for Battery Chargers
Charging VIN (V) (max) 7.25
Max. ICHG (A) 0.475
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 7.25
Charger (V) 3.6 to 4.6
Oper. Temp. (°C) -40 to +85
0 to +85
Package/Pins WLP/35
Budgetary
Price (See Notes)
$2.29 @1k
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.8
VIN (V) (max) 5.5
# Step-Down Outputs 3
# LDO Outputs 1
Battery Charger Features Battery Charger
Charge Timer
Input Current Limit
Smart Pwr. Selector
Thermal Die Regulation
Thermistor Input
VOUT (V) (min) 0.85
VOUT (V) (max) 5.5
Package/Pins WLP/35
Budgetary
Price (See Notes)
$2.29 @1k
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Simplified Block Diagram

MAX77278:Simplified Application Circuit MAX77278: Simplified Application Circuit Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Additional Resources

SIMO Calculator

Description

The MAX77278 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77278. The EV kit allows for easy evaluation of the various MAX77278 resources, including the linear charger, SIMO, linear regulator, analog multiplexer, IR current sink, GPIOs and I2C interface.

Windows-based software provides a user-friendly graphical interface (GUI) as well as a detailed register-based interface to exercise the features of the MAX77278.

View Details

Features

  • Easy to Use
    • GUI Drives I2C Interface
    • On-Board Thermistor
    • IR LED
    • GPIO Bank with Push-Buttons
    • Assembled and Fully Tested
  • Emulates System Loading
    • On-Board Electronic Load for LDO
    • Electronic Load has Steady-State, Transient, and Random Modes
  • Demonstrates End-to-End Analog Multiplexer Implementation
    • On-Board ADC
  • Evaluates Both Push-Button and Slider-Switch On-Key Options

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Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 7.25
Max. ICHG (A) 0.475
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 7.25
Charger (V) 3.6 to 4.6
Oper. Temp. (°C) -40 to +85
0 to +85
Package/Pins WLP/35
Budgetary
Price (See Notes)
$2.29 @1k
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.8
VIN (V) (max) 5.5
# Step-Down Outputs 3
# LDO Outputs 1
Battery Charger Features Battery Charger
Charge Timer
Input Current Limit
Smart Pwr. Selector
Thermal Die Regulation
Thermistor Input
VOUT (V) (min) 0.85
VOUT (V) (max) 5.5
Package/Pins WLP/35
Budgetary
Price (See Notes)
$2.29 @1k

Key Features

  • Highly Integrated
    • Smart Power Selector™ Li+/Li-Poly Charger
    • Three Output, SIMO Buck-Boost Regulator
    • 50mA LDO with SIMO Fixed Headroom Control
    • Programmable 250mA to 425mA Current Sink Driver
    • Analog MUX Output for Power Monitoring
    • Eight GPIOs (Configured for One-Button Wake-Up and Two-Button Shutdown)
  • Low Power
    • 0.3µA Standby Current
    • 16µA Operating Current
  • Charger Optimized for Small Battery Size
    • Programmable Fast-Charge Current from 7.5mA to 300mA
    • Programmable Battery Regulation Voltage from 3.6V to 4.6V
    • Programmable Termination Current from 0.375mA to 45mA
    • JEITA Battery Temperature Monitors Adjust Charge Current and Battery Regulation Voltage for Safe Charging
  • Flexible and Configurable
    • I2C-Compatible Interface
    • Eight GPIOs
    • Factory OTP Options Available
  • Small Size
    • 3.15mm x 2.15mm x 0.7mm
    • 35-Bump, 0.4mm-Pitch, 7x5 Ball Array, WLP
    • Small Total Solution Size (24mm2)

Applications/Uses

  • Internet of Things (IoT) Gadgets
  • Remote Controls, Game Pads, Media Center Controllers
  • Smart Home Automation Pads, Thermostats, Battery-Powered User Interfaces
  • Wearables, Fitness and Health Monitors

Description

The MAX77278 provides a highly-integrated battery charging and power supply solution for low-power applications where size and efficiency are critical.The device features a single-inductor multiple-output (SIMO) buck-boost regulator that provides three independently programmable power rails from a single inductor to minimize total solution size. A 50mA LDO provides ripple rejection for audio and other noise-sensitive applications. A highly-configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA).

The device includes other features such as a programmable current sink that can be used to drive an IR-LED, 8 general-purpose input/output (GPIO) control pins, and an analog multiplex (AMUX) output that provides access to useful battery charging signals. A bidirectional I2C interface allows for configuring and checking the status of the device. An internal on/off controller provides a controlled startup sequence for the regulators and provides supervisory functionality when the device is on. Numerous factory programmable options allow the device to be tailored for many applications, enabling faster time to market.

Design Solution: Choose a Tailored SIMO PMIC for Your Portable Design ›

Simplified Block Diagram

MAX77278:Simplified Application Circuit MAX77278: Simplified Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal